I am not using the arduino board, so the current does not come from the Arduino voltage regulator, I am using an 1A USB power adapter. The speaker is using a transistor and it's collector is connected to 5V, should the LEDs use a similar approach, using a resistor to step down and a transistor to boost up from 5V? Is this concept correct? If not, how can I work around the issue without changing too much my design without having to withdraw a few LEDs?